Initial commit

vendor/github.com/cockroachdb/errors/secondary/with_secondary.go

@@ -0,0 +1,89 @@
+// Copyright 2019 The Cockroach Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// permissions and limitations under the License.
+
+package secondary
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/cockroachdb/errors/errbase"
+	"github.com/gogo/protobuf/proto"
+)
+
+type withSecondaryError struct {
+	cause error
+
+	// secondaryError is an additional error payload that provides
+	// additional context towards troubleshooting.
+	secondaryError error
+}
+
+var _ error = (*withSecondaryError)(nil)
+var _ errbase.SafeDetailer = (*withSecondaryError)(nil)
+var _ fmt.Formatter = (*withSecondaryError)(nil)
+var _ errbase.SafeFormatter = (*withSecondaryError)(nil)
+
+// SafeDetails reports the PII-free details from the secondary error.
+func (e *withSecondaryError) SafeDetails() []string {
+	var details []string
+	for err := e.secondaryError; err != nil; err = errbase.UnwrapOnce(err) {
+		sd := errbase.GetSafeDetails(err)
+		details = sd.Fill(details)
+	}
+	return details
+}
+
+// Printing a withSecondary reveals the details.
+func (e *withSecondaryError) Format(s fmt.State, verb rune) { errbase.FormatError(e, s, verb) }
+
+func (e *withSecondaryError) SafeFormatError(p errbase.Printer) (next error) {
+	if p.Detail() {
+		p.Printf("secondary error attachment\n%+v", e.secondaryError)
+	}
+	return e.cause
+}
+
+func (e *withSecondaryError) Error() string { return e.cause.Error() }
+func (e *withSecondaryError) Cause() error  { return e.cause }
+func (e *withSecondaryError) Unwrap() error { return e.cause }
+
+func encodeWithSecondaryError(ctx context.Context, err error) (string, []string, proto.Message) {
+	e := err.(*withSecondaryError)
+	enc := errbase.EncodeError(ctx, e.secondaryError)
+	return "", nil, &enc
+}
+
+func decodeWithSecondaryError(
+	ctx context.Context, cause error, _ string, _ []string, payload proto.Message,
+) error {
+	enc, ok := payload.(*errbase.EncodedError)
+	if !ok {
+		// If this ever happens, this means some version of the library
+		// (presumably future) changed the payload type, and we're
+		// receiving this here. In this case, give up and let
+		// DecodeError use the opaque type.
+		return nil
+	}
+	return &withSecondaryError{
+		cause:          cause,
+		secondaryError: errbase.DecodeError(ctx, *enc),
+	}
+}
+
+func init() {
+	tn := errbase.GetTypeKey((*withSecondaryError)(nil))
+	errbase.RegisterWrapperDecoder(tn, decodeWithSecondaryError)
+	errbase.RegisterWrapperEncoder(tn, encodeWithSecondaryError)
+}